diff --git a/DESCRIPTION b/DESCRIPTION
index 555c0b5..d2f0a4f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -18,4 +18,6 @@ LinkingTo:
     RcppEigen
 Suggests:
     testthat,
-    mvtnorm
+    mvtnorm,
+    tmbstan,
+    rstantools
diff --git a/tests/testthat.R b/tests/testthat.R
index cfe519a..54f1eba 100644
--- a/tests/testthat.R
+++ b/tests/testthat.R
@@ -5,7 +5,6 @@ library(Rcpp)
 library(ModularTMBExample)
 library(mvtnorm)
 library(tmbstan)
-library(ggplot2)
 library(rstantools)